<h4>Basic Operations</h4>
<ul>
<li><i>Add Spirits</i>: Left-click on the spirit icon on tool bar, and then left-click at the scene where you want to add the spirit, or press [CTRL] and move mouse for a quick and massive adding.</li>
<li><i>Erase Spirits</i>: Left-click on the Eraser icon on tool bar, and the left-click at the spirit you want to erase, or press [CTRL] and move mouse for a quick and massive erasing.<li>
<li><i>Move Spirits</i>: Left-click on the spirit to select, keep pressed and move mouse to move the spirit. Multipul spirits can be selected by pressing [CTRL]</li>
<li><i>Set Spirits</i>: Right-click on the spirit to open the pop-up menu for setting that spirit. Massive settings for new created spirits can be found at [Options->Configure] dialog.</li>
</ul>

<h4>Brief Introduction of Spirits</h4>
<ol type="1" start="1">
<li><b>Block</b>: A thing that will stay in one's way and block the moving of it. [CTRL+1]</li>
<li><b>Cheese</b>: A delicious food, Mouse/Cat/Elephant all love to eat it and will be attracted by it. [CTRL+2]</li>
<li><b>Nail</b>: A painful thing, Mouse/Cat/Elephant are all afraid of it and never want to touch it. [CTRL+3]</li>
<li><b>Bomb</b>: A deadly thing, BOMB! No matter who stepping on it will go to ashes immediatelly. [CTRL+4]</li>
<li><b>Mouse</b>: A little smart robent, one of so-called Avatars, which preys on Elephants, and be preyed on by Cats. [CTRL+5]</li>
<li><b>Cat</b>: Another Avatar, which preys on Mice, and be preyed on by Elephants. [CTRL+6]</li>
<li><b>Elephant</b>: Another Avatar, which preys on Cats, and be preyed on by Mice. [CTRL+7]</li>
</ol>

<h4>Prey Diagram (predator -> prey)</h4>
<ul>
<li><pre>(Mouse -> Cheese), (Cat -> Cheese), (Elephant -> Cheese)</pre></li>
<li><pre>(Nail -> Mouse), (Nail -> Cat), (Nail -> Elephant)</pre></li>
<li><pre>(Bomb -> Mouse), (Bomb -> Cat), (Bomb -> Elephant)</pre></li>
<li><pre>(Cat -> Mouse -> Elephant -> Cat -> Mouse -> ...)</pre></li>
</ul>

<p>
<i>PS</i>: A spirit is born with a life value, the life increases when the spirit bites its preys (this can only happen to Avatars), and decreases when the spirit is biten by its predators.
When the life reduces to 0, the spirit is dead and deleted.
</p>

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